Thought I would share this since there is certainly a need for more VoIP troubleshooting tools:

"VoIPTroubleshooter.com Provides Free Call Quality Information and Online Diagnostic Tools For Network Managers, Including an Open Repository of Speech Files

Telchemy Incorporated, the global leader in real-time VoIP Performance Management software, today introduced an updated, expanded and redesigned VoIPTroubleshooter.com(TM) Web site. Sponsored by Telchemy, the site contains information and online diagnostic tools for network managers to use when investigating and resolving VoIP-related call quality problems. The site also contains background information, published articles and other useful references/links about voice quality, VoIP Performance Management and packet statistics.
Live today, VoIPTroubleshooter.com includes over 60 pages of diagnostic information related to VoIP call quality. Two new features include: an Open Speech Repository, i.e., data base, and an IP Network Impairment Simulator.
The Open Speech Repository provides high quality audio recordings of speech files in several different languages that test engineers can use for testing and related applications without any restrictions, except for source credit"

Click for more:
Telchemy Introduces VoIP Troubleshooter Web Site to Build Industry Confidence in Voice Over IP